We divide 133728 by 21
Let's see how many times 21 fits into 133728.

Advancing to step 1:
If we divide 1 by 21, we get 0 and a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 21

Moving on to step 2:
21 goes into 13 0 times with a remainder of 13.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 13 and we're left with 13.
Append the next digit (3) from the dividend to 13 and continue with: 133 / 21

Going ahead to step 3:
If we divide 133 by 21, we get 6 and a remainder of 7.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Subtract 126 from 133 to get 7.
Fetch the next digit (7) from the dividend, attach it to 7 and continue: 77 / 21

Going ahead to step 4:
When dividing 77 by 21, we get 3 with a remainder of 14.
Write down 3 as next digit of the result. 
Result so far: 63.0
Subtract 63 from 77 to get 14.
Bring next digit (2) of the dividend behind the 14 and repeat the process: 142 / 21

Step 5:
If we divide 142 by 21, we get 6 and a remainder of 16.
Write down 6 as next digit of the result. 
Result so far: 636.0
If we subtract 126 from 142, we get 16.
Grab the next digit (8) from the dividend, add it to 16, then carry on: 168 / 21

Going ahead to step 6:
21 goes into 168 8 times with a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 6368.0
Deduct 168 from 168 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 7:
0 divided by 21 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 6368.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
The number 21 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 6368.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 6368.0, with a leftover of 0.0.